CN209590112U - A kind of small signal deteching circuit removing dead zone voltage - Google Patents
A kind of small signal deteching circuit removing dead zone voltage Download PDFInfo
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- CN209590112U CN209590112U CN201822267793.XU CN201822267793U CN209590112U CN 209590112 U CN209590112 U CN 209590112U CN 201822267793 U CN201822267793 U CN 201822267793U CN 209590112 U CN209590112 U CN 209590112U
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- bias voltage
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- voltage resistance
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- small signal
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- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Abstract
The utility model relates to remove the small signal deteching circuit of dead zone voltage, LDO module, the first bias voltage resistance, the second bias voltage resistance and the current sampling resistor of voltage are provided including the MCU main control module with ADC detection function, for MCU main control module；LDO module, the first bias voltage resistance, the second bias voltage resistance, current sampling resistor and MCU main control module are sequentially connected electrically structure circuit；Current sampling resistor is electrically connected one end with the second bias voltage resistance and is electrically connected with sample rate current input terminal；Second bias voltage resistance is electrically connected one end with the first bias voltage resistance and is electrically connected with the end ADC of MCU main control module；A bias voltage is generated by the first bias voltage resistance and the second bias voltage electric resistance partial pressure, small signal is acquired using pseudo-differential mode, tradition directly acquisition semaphore relatively is the same to the mode cost and data expense on single-chip microcontroller ground, but the small signal results of detection are higher than the precision of traditional detection mode, consistency is more preferable.
Description
Technical field
The utility model relates to low current signal detection technique fields, more specifically to a kind of removal dead zone voltage
Small signal deteching circuit.
Background technique
Traditional detection small signal method is usually that directly acquisition semaphore carrys out and theoretical AD value the voltage on single-chip microcontroller ground
It makes comparisons.And the ADC detection of general chip has check frequency, that is, the dead zone voltage (OFFSEN) being commonly called as.General dead zone
Voltage is positive and negative 2-3mv, and this is very big for some small signals.Such detection method detects small signal and comes out
Resultant error it is very big, and consistency is very poor.If detected certainly using the higher ADC of precision, also can solve this
Problem, but cost increases very much.
Utility model content
The technical problem to be solved by the present invention is in view of the above drawbacks of the prior art, it is dead provide a kind of removal
The small signal deteching circuit of area's voltage.
The technical scheme adopted by the utility model to solve the technical problem is as follows:
Construct a kind of small signal deteching circuit for removing dead zone voltage, wherein including the MCU master control with ADC detection function
Module provides LDO module, the first bias voltage resistance, the second bias voltage resistance and the electricity of voltage for the MCU main control module
Flow sampling resistor；The LDO module, the first bias voltage resistance, the second bias voltage resistance, the current sample
Resistance and the MCU main control module are sequentially connected electrically structure circuit；The current sampling resistor and the second bias voltage resistance
Electrical connection one end is electrically connected with sample rate current input terminal；The second bias voltage resistance and the first bias voltage resistance electricity
Connection one end is electrically connected with the end ADC of the MCU main control module.
It is described in the utility model removal dead zone voltage small signal deteching circuit, wherein in the circuit, be provided with
The second bias voltage resistance and the filter capacitor of current sampling resistor parallel connection.
It is described in the utility model removal dead zone voltage small signal deteching circuit, wherein the current sampling resistor with
The MCU main control module is electrically connected one end ground connection.
The small signal deteching circuit of removal dead zone voltage described in the utility model, wherein the first biased electrical piezoelectricity
Resistance is adjustable resistance.
The small signal deteching circuit of removal dead zone voltage described in the utility model, wherein the second biased electrical piezoelectricity
Resistance is adjustable resistance.
A kind of small signal detecting method removing dead zone voltage, according to the small signal detection electricity of above-mentioned removal dead zone voltage
Road, its implementation are as follows:
The MCU main control module acquires the sample rate current input module without under input current state by the end ADC
One semaphore, and save；
The MCU main control module by the end ADC acquire the sample rate current input module have under input current state
Binary signal amount, and save；
Described adopt is calculated according to the difference of first semaphore and the second signal amount in the MCU main control module
The size of current and current direction inputted with current input module.
The small signal detecting method of removal dead zone voltage described in the utility model, wherein inputted in the sample rate current
Module is hindered without under input current state by adjusting the first bias voltage resistance and/or the second bias voltage resistance
Value, the ADC for adjusting the MCU main control module acquire linear and precision interval.
The utility model has the beneficial effects that: MCU main control module acquires sample rate current input module without defeated by the end ADC
Enter the first semaphore under current status and save, MCU main control module, which acquires sample rate current input module by the end ADC, input
Second signal amount under current status simultaneously saves, and passes through the first bias voltage resistance and the second bias voltage electric resistance partial pressure generates one
A bias voltage, acquires small signal using pseudo-differential mode, and MCU main control module is according to the first semaphore and second signal amount
Size of current and current direction using current input module input can be calculated in difference, and tradition relatively directly acquires signal
Measure it is the same to the mode cost and data expense on single-chip microcontroller ground, but detect small signal results than traditional detection mode precision more
Height, consistency are more preferable.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below in conjunction with attached drawing
And the utility model is described in further detail for embodiment, the accompanying drawings in the following description is only that the part of the utility model is implemented
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other accompanying drawings:
Fig. 1 is the small signal deteching circuit circuit diagram of the removal dead zone voltage of the utility model preferred embodiment；
Fig. 2 is the small signal detecting method flow chart of the removal dead zone voltage of the utility model preferred embodiment.
Specific embodiment
It is practical below in conjunction with this in order to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Technical solution in new embodiment carries out clear, complete description, it is clear that described embodiment is the portion of the utility model
Point embodiment, rather than whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not being paid
Every other embodiment obtained, belongs to the protection scope of the utility model under the premise of creative work.
The small signal deteching circuit of the removal dead zone voltage of the utility model preferred embodiment, as shown in Figure 1, including band
The MCU main control module 1 of ADC detection function, the LDO module 2 that voltage is provided for MCU main control module 1, the first bias voltage resistance 3,
Second bias voltage resistance 4 and current sampling resistor 5；LDO module 2, the first bias voltage resistance 3, the second bias voltage resistance
4, current sampling resistor 5 and MCU main control module 1 are sequentially connected electrically structure circuit；Current sampling resistor 5 and the second bias voltage resistance
4 electrical connection one end are electrically connected with sample rate current input terminal 6；Second bias voltage resistance 4 is electrically connected with the first bias voltage resistance 3
One end is electrically connected with the end ADC of MCU main control module 1；
MCU main control module 1 acquires sample rate current input module 6 without the first signal under input current state by the end ADC
It measures and saves, MCU main control module 1, which acquires sample rate current input module 6 by the end ADC, the second signal under input current state
It measures and saves, a bias voltage is generated by the first bias voltage resistance 3 and the second bias voltage resistance 4 partial pressure, using puppet
Differential mode acquires small signal, and MCU main control module 1 can be calculated according to the difference of the first semaphore and second signal amount
Using the size of current and current direction of current input module input, relatively tradition directly side of the acquisition semaphore to single-chip microcontroller ground
Formula cost and data expense are the same, but the small signal results of detection are higher than the precision of traditional detection mode, consistency is more preferable.
Preferably, in circuit, it is provided with the filtered electrical in parallel with the second bias voltage resistance 4 and current sampling resistor 5
Hold 7；Ensure detection stability.
Preferably, current sampling resistor 5 is electrically connected one end ground connection with MCU main control module 1.
Preferably, the first bias voltage resistance 3 is adjustable resistance, adjusts 3 resistance value of the first bias voltage resistance convenient for passing through,
The ADC for adjusting MCU main control module 1 acquires linear and best precision section and goes to detect, and further increases the precision of testing result
And consistency.
Preferably, the second bias voltage resistance 4 is adjustable resistance, adjusts 4 resistance value of the second bias voltage resistance convenient for passing through,
The ADC for adjusting MCU main control module 1 acquires linear and best precision section and goes to detect, and further increases the precision of testing result
And consistency.
A kind of small signal detecting method removing dead zone voltage, according to the small signal detection electricity of above-mentioned removal dead zone voltage
Road, as shown in Fig. 2, its implementation is as follows:
S01:MCU main control module acquires sample rate current input module without the first letter under input current state by the end ADC
Number amount, and saves；
S02:MCU main control module, which acquires sample rate current input module by the end ADC, has second under input current state to believe
Number amount, and saves；
S03:MCU main control module is calculated according to the difference of the first semaphore and second signal amount and inputs mould using electric current
The size of current and current direction of block input.
Preferably, in sample rate current input module without under input current state, by adjust the first bias voltage resistance and/
Or the second bias voltage resistance, the ADC acquisition for adjusting MCU main control module is linear and section that precision is best is gone to detect, into
The precision and consistency of one step raising testing result.
It illustrates:
Step 1: when system electrification, the semaphore that MCU first passes through ADC detection system when not having signal input, if do not examined
Consider device error, can also be preserved by writing system after theoretical calculation.Such as: LDO output is 3.3V, R1=43K, R2=
2K, R3=0.01R.
Theoretical calculation is as follows: when R3 no signal inputs, voltage on R3 can approximation 0V,
Vadc=3.3V*2/ (43+2)=0.147V
At this time the ADC input signal amount of MCU be 0.147V, this be MCU detection ADC be exactly no signal input when signal
Amount.
Step 2: the letter when the sample rate current for having 1A flows into, when the signal that MCU is detected at this time is exactly no signal input
It has been superimposed the semaphore of 1A electric current on the basis of number amount, has been to increase or reduce to depend on sample rate current as this semaphore
Direction.
Vr3=0.01*1=0.01V
That when electric current input is+1A:Vadc=0.147-0.01=0.137V
That when electric current input is -1A:Vadc=0.147+0.01=0.157V
ADC sampled result twice is done difference by step 3:MCU, so that it may know the size of electric current and direction at this time.
The utility model method can be detached from the detection dead zone of ADC, detection accuracy depends on completely because input signal amount is big
In the precision of ADC, and sampled signal can be adjusted to the best section of the ADC linearity by adjusting the resistance value of R1&R2.
So the utility model method is directed to this Collection, it is higher than the precision of traditional detection mode, consistency is more preferable, and
And do not increase additional cost.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations all should belong to the protection scope of the appended claims for the utility model.
Claims (5)
1. a kind of small signal deteching circuit for removing dead zone voltage, which is characterized in that including the MCU master control with ADC detection function
Module provides LDO module, the first bias voltage resistance, the second bias voltage resistance and the electricity of voltage for the MCU main control module
Flow sampling resistor；The LDO module, the first bias voltage resistance, the second bias voltage resistance, the current sample
Resistance and the MCU main control module are sequentially connected electrically structure circuit；The current sampling resistor and the second bias voltage resistance
Electrical connection one end is electrically connected with sample rate current input terminal；The second bias voltage resistance and the first bias voltage resistance electricity
Connection one end is electrically connected with the end ADC of the MCU main control module.
2. the small signal deteching circuit of removal dead zone voltage according to claim 1, which is characterized in that in the circuit,
It is provided with the filter capacitor in parallel with the second bias voltage resistance and the current sampling resistor.
3. the small signal deteching circuit of removal dead zone voltage according to claim 1 or 2, which is characterized in that the electric current
Sampling resistor is electrically connected one end ground connection with the MCU main control module.
4. the small signal deteching circuit of removal dead zone voltage according to claim 1, which is characterized in that first biasing
Voltage resistance is adjustable resistance.
5. the small signal deteching circuit of removal dead zone voltage according to claim 1, which is characterized in that second biasing
Voltage resistance is adjustable resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822267793.XU CN209590112U (en) | 2018-12-28 | 2018-12-28 | A kind of small signal deteching circuit removing dead zone voltage |
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| CN201822267793.XU CN209590112U (en) | 2018-12-28 | 2018-12-28 | A kind of small signal deteching circuit removing dead zone voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521256A (en) * | 2018-12-28 | 2019-03-26 | 合肥市芯海电子科技有限公司 | A kind of small signal deteching circuit and method removing dead zone voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109521256A (en) * | 2018-12-28 | 2019-03-26 | 合肥市芯海电子科技有限公司 | A kind of small signal deteching circuit and method removing dead zone voltage |
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